Method for making a neutral soap



Patented .lan. 13, 1925.

JO'HANNA KIRCHFELD, MUNICH, GERMANY.

METHOD FOR MAKING- A. NEUTRAL SOAP.

No Drawing.

To all MILO/I77. it may concern:

Be it known that I, J OHANNA KIRciIFELD, citizen 01"- Germany, residing at Amalien strasse #4, Munich, Bavaria, Germany, have invented new and useful Improvements in a Method for Making a Neutral Soap, of which the following is a specification.

My invention relates to a method for making a neutral soap, and more specifically, to a method involving the addition of albumens to a soap nucleus.

There are various known methods of making a neutral soap by adding albumens to either a liquid or solid soap for the purpose ot binding the alkalies which are liberated by the hydrolysis of the soap occurring in the aqueous solution. Another method utilizes an alcoholic solution of the by-product resulting from a treatment of casein with alkali and acidifying it, for the purpose of binding the alkali. Still another process of making washing compounds consists of using the first products of the action of alkalies upon proteins (such as casein or the basic salts of protalbin and lysalbin acids), and re-. moving the excess alkalinity by dialysis. It has also been proposed to produce a washing medium for use with unsoftened or salt water by treating at a high temperature oleins from cocoa fat, and materials rich in protein, with a highly concentrated caustic lye. In this process the proteins are converted into amino-fatty-acids and at the same time into the corresponding basic salts.

The characteristics of my method of producing a neutral soap lie in heating decomposed alubmens in the form of proteins and amino-acids with a large excess of alkali until a substantial emission of ammonia results, a metallic salt being added to combine with the excess lye, and, as the mass starts to solidify, it is added to an aqueous satu' rated soap nucleus.

For example, 50 kg. of greatly decomposed albumens in the form of bone-jelly Application filed. April 10, 1924:.

Serial No. 705,435.

and the like are heated with 17 kg. of soda lye to about 70 C. After the maximum emission of ammonia, 20 kg. of alum are added. After conversion and concentration of the mass, it is added to the same quantity by weight of a soap nucleus.

In this way, an inexpensive soap is produced which has exceptional washing properties and which does not injure fabrics. This result is based upon the substitution of part of the fatty-acids usually employed by decomposed protein products such as albumenoids. These colloids are preferably used in a quantity of at least 15%. They not only eli'ect a substantial saving of fatty-acids (a mixture of 23.5% of fatty-acids with 16.5% of products of decomposed albumen having at least the same washing power as that of an ordinary commercial soap containing 40% of fatty-acids), but the non-soap colloids increase the washing properties of the soap considerably. This is due to the increase in the viscosity of the solution, the quantity of effective suds, and the surface tension; and in general to the peculiar structure of the entire soap system, the added metallic salts contributing thereto in that they increase the effect of the other component parts substantially and at the same time eliminate as far as possible the usual disagreeable odor characteristic of decomposed albumens.

lVhat I claim is:

The method of making a neutral soap which consists in heating decomposed albumens with an excess of alkali until after a substantial emission of ammonia, adding alum to bind the excess lye, and when solidification begins, adding the mass to an aqueous saturated soap nucleus.

In testimony whereof I affix my signature.

JOHANNA KIRGHFELD. lVitnesses:

Ann Soro, ALEsEI Pmmrror'r'. 

